"In the original L. Frank Baum books there are many witches and creatures, many more than were in the original," Franco explained. "This Oz is a little different. You get to see a lot more of who this Oz is... The search for [his heart] is one of the main themes of this movie."

Directed by Sam Raimi (Spider-Man), Oz The Great and Powerful was written by Mitchell Kapner (The Whole Nine Yards) and David Lindsay-Abaire (Rabbit Hole). The cast includes Zach Braff as Franco's circus assistant and the voice of a CGI winged monkey named Finley, and Joey King as the voice of CGI character China Girl. Expect more to be revealed this Thursday, when Reelz covers Disney's Comic-Con panel.